Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a fifth image thereof; and,

FIG. 6 is a sixth image thereof.

The two outermost broken lines from the graphical interface illustratethe display screen. The remaining broken lines illustrate portions ofthe article of manufacture. None of the broken lines form part of theclaimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-6. No ornamental aspects areassociated with the process or period in which one image transitions toanother image.

CLAIM We claim the ornamental design for a display screen or portionthereof with transitional graphical user interface, substantially asshown and described.